In another report, it is suggested that the level of nitrogen oxide between 0.2 and 0.6 ppm is harmless for the human population. As a powerful oxidant, O3 accepts electrons from other molecules. There is a high level of polyunsaturated fatty acids in the surface fluid lining of the respiratory tract and cell membranes that underlie the lining fluid. The double bonds available in these fatty acids are unstable. O3 attacks unpaired electron to form ozonides and progress through an unstable zwitterion or
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